The primary goal of the Lewis and Clark Expedition, which took place from 1804 to 1806, was to explore and map the newly acquired Louisiana Territory following the 1803 purchase.

Commissioned by President Thomas Jefferson, the expedition sought to investigate the geography, natural resources, and indigenous cultures of the region. Additionally, the explorers aimed to find a practical route to the Pacific Ocean. Led by Meriwether Lewis and William Clark, the expedition provided valuable information about the American West, paving the way for future exploration and settlement while enhancing U.S. claims to the land.